Coal-cutting machine.



2 SHEETS-SHEET 2.

ATTORNEY PATENTED SEPT. I1, 1906.

A. S. HAMILTON. CUAL CUTTING MACHINE.

LPPLIUATION FILED AUG. 1s. 1905.

Il l lill/l] INVENTUR /fffl/iz lila/1 WITNESSES;

ABRAM s. nAMiLToN, orNANAiMo, 'BRrrIsH- ooLUMnia CANADA.

COAL-CUTTING MACHINE..

Specification of Letters Patent.

Patented Sept. 11, 1906.

Application l-ediAugust 18, 1905. Serial No. 274.725.

T all whom it muy concern:

Be it known that I, ABRAM S. HAMiuToN., a citizen of the Dominion ofCanada', residing Aat the city of Nanaimo, in theProvince of BritishColumbia, Canada, have invented new and useful Improvements inCoal-'Cut- I ting Machines, of Which the followingy is a specification.l My invention relates to the application of a percussive drill toeffect the cutting of'coal by either undermining or shearing; butalthough designed particularly for such work it is also applicable toany purpose wherein..

an effective rock-drill is required having a wide scope and readymobility.

' The machine is of hat class wherein the drill-cylinder is moved inradial lines in either horizontal or vertical planes to effect theundercutting or shearing from centers which are adjacent to its sup ort.Inmachines of this character the a vance or feed of the cutting tool ordrill is usually attained by mounting the drill-cylinder in a cradlesecured to the supporting-column, along which cradle the-drill-cylinderis slidably moved b a feed-screw, the desired rotation of the dri lratchet-wheel. sign are that the slide a in the bore being effected by arifle-bar and The ob'ections to this deiong which the drillcylinder ismoved is exposed to a very conslderable amount of wear on account ofgrit and. dirt accumulating on it, and the construction of the cradle issuch that the airis of the drill-cylinder cannot be brou ht as close tothe supporting-column as is esirable inor- A der to feed the drillstrongly to its Work on vacsiderable lateral offset produces.

count of the torsional moment Which the con- The-feedscreW beingcomparatively small is subjected to rapid Wear, as also is thevrifle-bar and its connected mechanism by which rotation of the drill iseffected. l Y

The object of this invention has` been to overcome these faults byproviding a feedscrew on the -errternalsurface of the drill-cylinderitself, by which means I am enabled to bringthe axis of thedrill-cylinder as close as practicable to the column by which it issupported, While at the same time I dispense altogether With the 'indeendent feed-screw, and as the cylinder itsef is rotated to feed thedrillforward the desired rotation of the drill is obtained in that rotationwithout requiring the use of a ride-bar, &c. Iamv thus enabled todispense altogether with the parts that are usually regarded as the weakpoints of a percussive drill and can bring the axis ofthe drill-cylinderso close to the column that the torsional movement thereon is notsuflicient to prevent the rapid rate of feed being imparted to thedrill, while at the samer time the working parts are both simpler tomanufacture an easier to maintain in good working order. y

To enable a screw-thread to be formed on the external surface of thedrill-cylinder, I adopt a valve to control the admission and release ofthe compressed air to and from the ciylinder, the axis of whichcorresponds with t at of the cylinder-bore and is automatically operatedby the movement of the piston-rod. There are also several other novelfeatures in the construction ofthe drill to which attention is drawn inthe following specification, reference being made to the drawings whichaccompany it, in Which Figure 1 shows in elevation the drill mounted tothe supporting-column by a mechanism by which a radial movement ineithera vertical or a horizontal plane may be imparted to the drill.`Fig- 2 shows a side view of the foot-step of the supporting-column. Fig.3 shows in plan the same manner of drillmounting las illustrated inFig. 1. Fig. 4 is a detail vof an alternative means for mounting the'drill-cylinder to thecolumn direct and gives a radial movement in ahorizontal plane; Fig. 5, an elevation of the cylindercarrying nut; Fig.6, a plan of the mechanism shown in Fig. 4; Fig. 7, an offset stud orarm which being clamped to the column is adapted to receive the samemechanism as is illustrated in Figs. 4 and 6 and enables a ver- .ticalor shear movement of the drill in radial mes.

On referring to Figs. 1, 2, and 3, which illustrate the a lication of myinvention to a mechanismw` ch will provide in one head for radialmovement in either a horizontal or vertical plane, 2 represents thecolumn b which the drill-head is supported and whic may be furnishedwith the customary jackscrew for tightening the column between the wallsor between floor and roof of the drift or gallery in which it is desiredt0 work. The foot of the column is provided with a spherical end 3,which is stepped into a base-block 4, endwise slidable on the base-plate5 by means of a screw 6. This provides means for inclining the columntosuit the stratification of the vein or drift in which the drill may berequired to work. A double clamp mem- IOC as occasion may require.

.it a worm-wheel segment 12 ber 10 is provided, which may be secured atany deslred position on ,the column 2 by the bolts which clamp the twohalves together.

Between the two halves of this clamp is mounted so as to be susceptibleof rotation on the column or. on the same axis a sleeve or bearing 11,having secured to or integral with into the teeth of which meshes thethread ofa worm 13, mounted so as to be rotatable between the two partsof the clam i member 10 by means of a handle 14. On tlhe opposite-sideof this bearing 11 to the worin-wheel segliient and forming one piecewith the bearing is a boss 15, the axis of which is at right angles tothat of the bearing 11 and is bored to receive a pin or stud 16,projecting from a nut member .17, which forms` thedrill-cylinder-carrying head designed to carry the drill-cylinder 25.Secured on the. pin 16 of the nut member 17 isa \\'orm\\'heel segment1S, into the teeth of which meshes the thread of a worin-wheel 20,supported between bearings 21, projecting from the boss 15, androtatable in these bearings bymeans of a handle 22. The member 17 isdesigned to receive a scre\\'thread cut in the outside surface of thedrill-cylinder 25, the end of which drill-cylinder is furnished with ahand-wheel 27, by which the cylinder may be rotated, and thereby movedin or out of the nut `and advanced to or withdrawn from its work.

In the alternative design illustrated in Figs. 4, 5, 6, and 7 thedrill-cylinder is radially directed by a single rotating mechanism,which may be secured to either the column 2 or to a projecting stud orarm removably secured to the column, according asa horizontal or avertical movement is required. The supplementary stud or arm isillustrated in Fig. 7 and comprises a cylindrical portion 31, the di-vameter of which is the same as that of the column 2, to which it may besecured by the divided clamp portion 32. The drill-cylindercarrying heador nut 17 in this design is secured to the rotatable bearing member 11in a manner that will allow the nut to bebrought close to the column 2or the projecting arm 31, according as it is secured to either one orthe other, and the bearing member 11 is furnished with a worm-wheelsegment 12 as before, in the teeth of which meshes the worm 13,rotatable in the bearings 33 by the handle 14. The bearings 33, whichsupportthe worin-shaft, form a part of a clamp member 34, by which thedevice may be secured on either the column 2 or the projecting stud 31,The rotatable head which carries the drill-cylinder nut is maintained inits position by a collar 35, which may be secured to the column or thestud either by set-screws, as drawn, or by clamping with a boltJ andnut. By this construction the rotational mechanism is simplified, and Iam enabled, as will be seen in Fig.

4, to bring the axis of the drilllcylinder as as close as practicable tothe column or offset stud.

In the operation of the machine the clamp 10 or 34 is secured to eitherthe column 2 or its projecting arm 31, and the support-column beingadjusted by means of the baseblock t to suit the stratification of thecoal or rock the drill or cutting tool is swept across ythe face of theworking for undercutting or moved vertically in a similar manner to elfect the shearing, while the drill-cylinder is fed forward by thehand-wheel 27, which at the same time effects the rotation of the drillin the drill-hole. The working agent is admittedinto tho drill throughthe pipe 30, and the construction of the drill per se may be of anyapproved type, as the same per se forms no part of my present invention.

What l claim is- 1. In a machine of the. class described, thecombination with a supporting-column, of a double clamp member securedto said eolumn, and including a bridge portion, a wormscrew-carryingshaft mounted in said bridge portion, a crank for turning said shaft, asleeve mounted between the clamp portions of said clamp member, aseglnental gear fixedly carried by said sleeve, abearing member carriedby said sleeve with its bearing 9 portion at right angles to the axis ofthe collar, a drill-cylinder-carrying head having a shaft portionprojecting through said lastnamed bearing member, a segmental gear onsaid shaft portion, a pair of arms projecting from said sleeve-bearingmember, a wormserew including a shaft mounted between said last-namedarms and engaging said seg mental gear, a crank vfor said last-namedworin-screw shaft, and a drill held with its cylinder in saidcarrying-head, substantially as shown and described.

2. In a machine of the class described, the combination with asupporting-column, of a clamp member secured to said column andincluding a bridge portion, a Worm-screwcarrying shaft mounted in saidbridge p'ortion, means for turning said shaft, a sleeve mounted on thecolumn in cooperative engagement with the clamp, a segmental gearfrxedly carried by said sleeve, a bearing member carried by said sleevewith its bearing portion at right angles to the axis of the collar, adrill-cylinder-carrying head having a portion cooperating with saidlast-named bearing member, and a drill held with its cylinder in saidcarrying-head, substantially as shown and described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribingwitnesses.

. A. S. HAMILTON. Witnesses:

v A. B. Joi'INsToN,

J. H. SIMPSON.

TOO

IIS

